Fuel Shut-Off System

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The Fuel Shut-Off System was introduced in some 1980 B310 USA models. It leverages the anti-diesel valve to stop the fuel flow during periods of deceleration. This is similar to what EFI systems do. It is only active at higher speeds, namely above 40mph.

1980: All California models  
1980: FED A15.MT
1981 CAL, FED, FED.MPG and CAN.MPG models. 
  Canada models did not use fuel-shut off except for 
  MPG (FU Engine) models.

For safety and good performance, the FSOS does not work unless the engine is decelerating.

• Only works when decelerating (vacuum is high AND speed above 40mph)
• Does not work in nuetral, so engine will not stop due to lack of fuel
• Does not work when clutch is engaged (so you can blip the throttle)

Components are:

• Anti-diesel valve (solenoid)
• Vacuum valve
• Speedometer speed switch, amplifier and relay
  • Also used by CAL Mixture Ratio Rich-Lean Exchange System
• Automatic Transmission inhibitor switch
• Manual Transmission nuetral switch
• Clutch pedal switch

This would be an interesting system to retrofit to older models for increased fuel economy.